Ok this is only my second thread but I've been in the hobby since 05 and have always considered the glass diffuser whistle a necessary (even though annoying) noise. I know there are other diffusers which run silently (up) but they require a certain amount of pressure and I bought my pressurized system without that capability.
Long story short I broke my diffuser during a recent clean and bought a replacement on ebay. It has been running silently for 2 weeks. I've let the diffuser get dirty expecting it to wistle at some point and so far nothing, not even a whisper. Completely and utterly silent and while I'm not here to push any brand or product I highly recommend this from one hobbyist to the next. I'm not sure about the rules on posting ebay links but this is a pic of the diffuser...
Long story short I broke my diffuser during a recent clean and bought a replacement on ebay. It has been running silently for 2 weeks. I've let the diffuser get dirty expecting it to wistle at some point and so far nothing, not even a whisper. Completely and utterly silent and while I'm not here to push any brand or product I highly recommend this from one hobbyist to the next. I'm not sure about the rules on posting ebay links but this is a pic of the diffuser...